Bose-Einstein condensates of ⁸⁵Rb provide a flexible platform for studying tunable quantum gases, for the scattering length can be widely controlled by a magnetic field near a Feshbach resonance. However, the production of a stable ⁸⁵Rb condensate is more challenging than that of ⁸⁷Rb, owing to the strong magneticfield dependence of both elastic collisions and inelastic loss. In this work, we report the rapid production of a ⁸⁵Rb Bose-Einstein condensate in an optical dipole trap and characterize the key experimental conditions for efficient evaporation and interaction-tunable spectroscopy. After laser cooling and optical trapping, the atoms are prepared in the |5S_1/2, F = 2, m_F = -2〉 state by optical pumping. We compare three opticalpumping schemes based on the D1 and D2 transitions and find that the D1-line scheme gives the best statepreparation performance. This improvement originates from the larger excited-state hyperfine splitting, which favors dark-state formation and reduces unwanted population leakage. With the optimized opticalpumping sequence, forced evaporation is performed in a magnetic field close to the Feshbach resonance. The evaporation trajectory gives an efficiency ofη = 2:20(2), and a pure condensate containing 2:8(3)×10⁴atoms is obtained. We further identify 163-164.5 G as an efficient magnetic-field window for opticaltrap evaporation of ⁸⁵Rb. In this region, the elastic collision rate is sufficiently high while the inelastic loss remains moderate, so that the number of good elastic collisions per lifetime exceeds 300. Outside this window, the evaporation becomes inefficient because of either insufficient elastic collisions or enhanced atom loss. These measurements provide practical criteria for optimizing the production of ⁸⁵Rbcondensates in an all-optical trap. Using the magnetic-field tunability of the scattering length, we then investigate the interaction-dependent excitation spectrum of the condensate by Bragg spectroscopy. Two counterpropagating Bragg beams are used to excite the condensate, and the spectral shift is measured for different scattering lengths and densities. For relatively weak interactions, the observed shift agrees with the meanfield prediction. At larger scattering lengths, the measured excitation frequency deviates from the meanfield result, and the deviation can be explained by including the Lee-Huang-Yang correction. This work provides a reliable technical foundation for future precision measurement and quantum simulation studies based on ⁸⁵Rb BECs.